Canon Speedlite Transmitter ST-E3-RT

Speedlite Flash

Speedlite Transmitter ST-E3-RT

Canon Speedlite Transmitter ST-E3-RT

A radio-frequency flash trigger aimed at professional photographers using off-camera flash.

Fire compatible Speedlite flashguns over distances of up to 30m. Radio-frequency control provides reliable operation even when direct line of sight is not possible.

  • Radio frequency remote flash trigger
  • Fire selected Speedlites from 30m away
  • Part of the E-TTL II flash system
  • Controls up to 15 flashguns
  • Remote camera triggering
  • Weather sealed against dust and moisture.

Reliable off-camera flash control

Control compatible Canon Speedlite flashguns over distances up to 30m. 2.4GHz radio frequency triggering operates reliably, even when shooting outdoors and around corners – direct line of sight not required.

Multiple flash photography

Create intricate multi-flash lighting set ups, triggering up to 15 Speedlite flashes with a single camera-mounted Speedlite Transmitter ST-E3-RT. E-TTL II flash metering makes exposure control easy.

Remote camera control

Trigger an EOS camera fitted with a Speedlite Transmitter ST-E3-RT from a second unit or from a compatible Speedlite flashgun, such as the Speedlite 600EX-RT. Up to 15 cameras can be triggered at once, for synchronised shooting.

Easy to use design

The Speedlite Transmitter ST-E3-RT is sealed against dust and moisture to the same degree as professional EOS cameras and L-series lenses. It features an easy to read back-lit LCD control screen and is powered by two AA/LR6 batteries.

Product Specification

FLASH MODES

Auto exposure control E-TTLII/E-TTL/TTL
High speed sync (FP) Yes
Manual / output settings Yes - 1/1-1/128
Manual steps 1/3 step
Strobe / output settings Yes - 1/4-1/128
Frequency -500Hz

FLASH-RELATED FUNCTION

FE lock Yes
Flash exposure compensation Yes
Flash exposure bracketing Yes
Second-curtain flash sync No
Modelling flash Yes
Colour temperature info communication No

WIRELESS FLASH

Transmitter Yes
Transmission type Radio
Transmitter Max range approx. Indoors: 30m
Outdoors: 30m
Slave No
No. of groups 5
No. of channels 15
Remote Shutter Release Yes

AF ASSIST

AF-assist beam No

POWER SOURCE

Battery 2 x AA batteries
External power supply No

CONSTRUCTION

Dust and water resistance Yes
Mounting foot material Metal
Custom function 8 (3 personal functions)
PC terminal No
Compatible accessories SPEEDLITE 600EX-RT
Dedicated flash bracket No

DIMENSIONS & WEIGHT

Size (W x H x D), mm 67.4 x 61.5 x 77.4¹
Weight (Excluding batteries), grams 110g
Size (W x H x D), mm ¹ Except for the dust and water prevention adaptor
  • * Time taken to recharge flash after full discharge using Alkaline AA batteries.
  • ** With Compatible cameras only.